/*
 * Mesa 3-D graphics library
 *
 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "util/glheader.h"
#include "draw_validate.h"
#include "bufferobj.h"
#include "context.h"
#include "enums.h"
#include "feedback.h"
#include "framebuffer.h"
#include "image.h"
#include "pbo.h"
#include "pixel.h"
#include "state.h"
#include "glformats.h"
#include "fbobject.h"
#include "util/u_math.h"
#include "util/rounding.h"
#include "api_exec_decl.h"

#include "state_tracker/st_cb_bitmap.h"
#include "state_tracker/st_cb_drawpixels.h"

/*
 * Execute glDrawPixels
 */
void GLAPIENTRY
_mesa_DrawPixels( GLsizei width, GLsizei height,
                  GLenum format, GLenum type, const GLvoid *pixels )
{
   GLenum err;
   GET_CURRENT_CONTEXT(ctx);

   FLUSH_VERTICES(ctx, 0, 0);

   if (width < 0 || height < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glDrawPixels(width or height < 0)" );
      return;
   }

   /* We're not using the current vertex program, and the driver may install
    * its own.  Note: this may dirty some state.
    */
   _mesa_set_vp_override(ctx, GL_TRUE);

   _mesa_update_pixel(ctx);

   if (ctx->NewState)
      _mesa_update_state(ctx);

   if (!ctx->DrawPixValid) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawPixels");
      goto end;
   }

   /* GL 3.0 introduced a new restriction on glDrawPixels() over what was in
    * GL_EXT_texture_integer.  From section 3.7.4 ("Rasterization of Pixel
    * Rectangles) on page 151 of the GL 3.0 specification:
    *
    *     "If format contains integer components, as shown in table 3.6, an
    *      INVALID OPERATION error is generated."
    *
    * Since DrawPixels rendering would be merely undefined if not an error (due
    * to a lack of defined mapping from integer data to gl_Color fragment shader
    * input), NVIDIA's implementation also just returns this error despite
    * exposing GL_EXT_texture_integer, just return an error regardless.
    */
   if (_mesa_is_enum_format_integer(format)) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawPixels(integer format)");
      goto end;
   }

   err = _mesa_error_check_format_and_type(ctx, format, type);
   if (err != GL_NO_ERROR) {
      _mesa_error(ctx, err, "glDrawPixels(invalid format %s and/or type %s)",
                  _mesa_enum_to_string(format),
                  _mesa_enum_to_string(type));
      goto end;
   }

   /* do special format-related checks */
   switch (format) {
   case GL_STENCIL_INDEX:
   case GL_DEPTH_COMPONENT:
   case GL_DEPTH_STENCIL_EXT:
      /* these buffers must exist */
      if (!_mesa_dest_buffer_exists(ctx, format)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glDrawPixels(missing dest buffer)");
         goto end;
      }
      break;
   case GL_COLOR_INDEX:
      if (ctx->PixelMaps.ItoR.Size == 0 ||
          ctx->PixelMaps.ItoG.Size == 0 ||
          ctx->PixelMaps.ItoB.Size == 0) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                "glDrawPixels(drawing color index pixels into RGB buffer)");
         goto end;
      }
      break;
   default:
      /* for color formats it's not an error if the destination color
       * buffer doesn't exist.
       */
      break;
   }

   if (ctx->RasterDiscard) {
      goto end;
   }

   if (!ctx->Current.RasterPosValid) {
      goto end;  /* no-op, not an error */
   }

   if (ctx->RenderMode == GL_RENDER) {
      if (width > 0 && height > 0) {
         /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
         GLint x = lroundf(ctx->Current.RasterPos[0]);
         GLint y = lroundf(ctx->Current.RasterPos[1]);

         if (ctx->Unpack.BufferObj) {
            /* unpack from PBO */
            if (!_mesa_validate_pbo_access(2, &ctx->Unpack, width, height,
                                           1, format, type, INT_MAX, pixels)) {
               _mesa_error(ctx, GL_INVALID_OPERATION,
                           "glDrawPixels(invalid PBO access)");
               goto end;
            }
            if (_mesa_check_disallowed_mapping(ctx->Unpack.BufferObj)) {
               /* buffer is mapped - that's an error */
               _mesa_error(ctx, GL_INVALID_OPERATION,
                           "glDrawPixels(PBO is mapped)");
               goto end;
            }
         }

         st_DrawPixels(ctx, x, y, width, height, format, type,
                       &ctx->Unpack, pixels);
      }
   }
   else if (ctx->RenderMode == GL_FEEDBACK) {
      /* Feedback the current raster pos info */
      FLUSH_CURRENT( ctx, 0 );
      _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
      _mesa_feedback_vertex( ctx,
                             ctx->Current.RasterPos,
                             ctx->Current.RasterColor,
                             ctx->Current.RasterTexCoords[0] );
   }
   else {
      assert(ctx->RenderMode == GL_SELECT);
      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
   }

end:
   _mesa_set_vp_override(ctx, GL_FALSE);

   if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
      _mesa_flush(ctx);
   }
}


void GLAPIENTRY
_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
                  GLenum type )
{
   GET_CURRENT_CONTEXT(ctx);

   FLUSH_VERTICES(ctx, 0, 0);

   if (width < 0 || height < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
      return;
   }

   /* Note: more detailed 'type' checking is done by the
    * _mesa_source/dest_buffer_exists() calls below.  That's where we
    * check if the stencil buffer exists, etc.
    */
   if (type != GL_COLOR &&
       type != GL_DEPTH &&
       type != GL_STENCIL &&
       type != GL_DEPTH_STENCIL &&
       type != GL_DEPTH_STENCIL_TO_RGBA_NV &&
       type != GL_DEPTH_STENCIL_TO_BGRA_NV) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glCopyPixels(type=%s)",
                  _mesa_enum_to_string(type));
      return;
   }

   /* Return GL_INVALID_ENUM if the relevant extension is not enabled */
   if ((type == GL_DEPTH_STENCIL_TO_RGBA_NV || type == GL_DEPTH_STENCIL_TO_BGRA_NV) &&
       !ctx->Extensions.NV_copy_depth_to_color) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glCopyPixels(type=%s)",
                  _mesa_enum_to_string(type));
      return;
   }

   /* We're not using the current vertex program, and the driver may install
    * it's own.  Note: this may dirty some state.
    */
   _mesa_set_vp_override(ctx, GL_TRUE);

   _mesa_update_pixel(ctx);

   if (ctx->NewState)
      _mesa_update_state(ctx);

   if (!ctx->DrawPixValid) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glCopyPixels");
      goto end;
   }

   /* Check read buffer's status (draw buffer was already checked) */
   if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
                  "glCopyPixels(incomplete framebuffer)" );
      goto end;
   }

   if (_mesa_is_user_fbo(ctx->ReadBuffer) &&
       ctx->ReadBuffer->Visual.samples > 0) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
		  "glCopyPixels(multisample FBO)");
      goto end;
   }

   if (!_mesa_source_buffer_exists(ctx, type) ||
       !_mesa_dest_buffer_exists(ctx, type)) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glCopyPixels(missing source or dest buffer)");
      goto end;
   }

   if (ctx->RasterDiscard) {
      goto end;
   }

   if (!ctx->Current.RasterPosValid || width == 0 || height == 0) {
      goto end; /* no-op, not an error */
   }

   if (ctx->RenderMode == GL_RENDER) {
      /* Round to satisfy conformance tests (matches SGI's OpenGL) */
      if (width > 0 && height > 0) {
         GLint destx = lroundf(ctx->Current.RasterPos[0]);
         GLint desty = lroundf(ctx->Current.RasterPos[1]);
         st_CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
                        type );
      }
   }
   else if (ctx->RenderMode == GL_FEEDBACK) {
      FLUSH_CURRENT( ctx, 0 );
      _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
      _mesa_feedback_vertex( ctx,
                             ctx->Current.RasterPos,
                             ctx->Current.RasterColor,
                             ctx->Current.RasterTexCoords[0] );
   }
   else {
      assert(ctx->RenderMode == GL_SELECT);
      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
   }

end:
   _mesa_set_vp_override(ctx, GL_FALSE);

   if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
      _mesa_flush(ctx);
   }
}


void
_mesa_bitmap(struct gl_context *ctx, GLsizei width, GLsizei height,
             GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
             const GLubyte *bitmap, struct pipe_resource *tex)
{
   FLUSH_VERTICES(ctx, 0, 0);

   if (width < 0 || height < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap(width or height < 0)" );
      return;
   }

   if (!ctx->Current.RasterPosValid) {
      return;    /* do nothing */
   }

   _mesa_update_pixel(ctx);

   if (ctx->NewState)
      _mesa_update_state(ctx);

   if (!ctx->DrawPixValid) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glBitmap");
      return;
   }

   if (ctx->RasterDiscard)
      return;

   if (ctx->RenderMode == GL_RENDER) {
      /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
      if (width > 0 && height > 0) {
         const GLfloat epsilon = 0.0001F;
         GLint x = util_ifloor(ctx->Current.RasterPos[0] + epsilon - xorig);
         GLint y = util_ifloor(ctx->Current.RasterPos[1] + epsilon - yorig);

         if (!tex && ctx->Unpack.BufferObj) {
            /* unpack from PBO */
            if (!_mesa_validate_pbo_access(2, &ctx->Unpack, width, height,
                                           1, GL_COLOR_INDEX, GL_BITMAP,
                                           INT_MAX, (const GLvoid *) bitmap)) {
               _mesa_error(ctx, GL_INVALID_OPERATION,
                           "glBitmap(invalid PBO access)");
               return;
            }
            if (_mesa_check_disallowed_mapping(ctx->Unpack.BufferObj)) {
               /* buffer is mapped - that's an error */
               _mesa_error(ctx, GL_INVALID_OPERATION,
                           "glBitmap(PBO is mapped)");
               return;
            }
         }

         st_Bitmap(ctx, x, y, width, height, &ctx->Unpack, bitmap, tex);
      }
   }
   else if (ctx->RenderMode == GL_FEEDBACK) {
      FLUSH_CURRENT(ctx, 0);
      _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
      _mesa_feedback_vertex( ctx,
                             ctx->Current.RasterPos,
                             ctx->Current.RasterColor,
                             ctx->Current.RasterTexCoords[0] );
   }
   else {
      assert(ctx->RenderMode == GL_SELECT);
      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
   }

   /* update raster position */
   ctx->Current.RasterPos[0] += xmove;
   ctx->Current.RasterPos[1] += ymove;
   ctx->PopAttribState |= GL_CURRENT_BIT;

   if (MESA_DEBUG_FLAGS & DEBUG_ALWAYS_FLUSH) {
      _mesa_flush(ctx);
   }
}

void GLAPIENTRY
_mesa_Bitmap(GLsizei width, GLsizei height,
             GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
             const GLubyte *bitmap)
{
   GET_CURRENT_CONTEXT(ctx);

   _mesa_bitmap(ctx, width, height, xorig, yorig, xmove, ymove, bitmap, NULL);
}
